Watch-crown



(No Model.)

' T. MUBLLER'.

'WATCH CROWN.l

Patented Deo. 5, 1882.

lllven 01# Zi/40W Mw m-Lnmnpher, mmm n. c.

Ens. Pho

UNITED STATES PATENT OEEICE.

WATCH-CROWN.

SPECIFICATION forming part of Letters Patent No. 268,713, dated December 5, 1882.

Application filed December 1,188l. (No model.)

lTo alt whom fit may concer-u Be it known that I, TnEoDoRE. MUELLER, oi the city and county of Philadelphia, and State of Pennsylvania, have invented an Improvementin Watch-Crowns, of which the following is a specification.

My invention relates to watch-crowns and push-pins for watch-cases; and it consists in forming a push-pin and head of base metal and securing a covering of gold or silver or plated metal upon the same by upsetting the said gold or silver or forcing the edge ot' the baseinetal head into same, all of which is more fully set forth in the following specification and shown in the accompanying drawings, which form part thereof.

Heretofore the crowns of push-pins have been made of solid gold or silver and secured upon said push-pin by solder or by screwthreads; or the said crowns have been made of base metal and simply plated. It is also common to cover nail-heads with brass pieces or caps; but in these cases there is no pushpin, the caps could not be used with watchpendants, and the caps are not secured to the nail by upsetting.

The object of this invention is to secure to the top of a push-pin made of base metal a gold or silver cap without the use of solder, and form the same into the watch-crown.

In the drawings, Figure lis au elevation of the push-pin without the cap. Fig. 2 is a sectional elevation of the cap. Fig. 3 is a plan of cap. Fig. 4 is a sectional elevation of the completed crown and push-pin, and Fig. 5 is a perspective view ofthe same.

A is the body of the push-pin.

B is the flange, and is circumterentially grooved around its upper edge, as at D, therebygiving a sharp circumferential edge around its lower rim, as at C.

E is the cap, which is formed into the crown, and is adapted to be made of gold or silver. This cap is placed over the ilan ge B and placed between dies G and H, which force it down into position and clamp the cap around the iiange, the edge C entering circumferentially into the inner side of the body ofthe cap, as shown in Fig. 4; or the rim of the cap may be upset over the underside of the iange by the action of the dies, which squeeze the metal cap vertically, causing it to be forced bodily under the edge of the said ange, thereby changing its thickness at this part. This is accomplished by making the dies stepped, as shown in dotted lines, and after the upper die has descended a certain distance the bottom rim of the cap rests upon one of the steps of the lower die, and upon the furtherdcscent of the upper die the metal of the cap is caused to change its shape just below the flange ot' the push-pin by iiowing into a space left byone ofthe said steps in the lower die. The upper circumferential edge of the cap is forced down to correspond with the groove D, as at D. The crown is then turned out, as at F, as shown in Fig. 4, and,ifdesired,milled to give a finish. The shape of the ilange B may be varied as desired without departing from my improve ment, as my invention comprehends broadly all means ot' securing the precious-metal cap or crown upon the base-metal push-pin without the use of solder or its equivalent.

Having now described my inventiomwhat I claim as new, and desire to secure by Letters Patent, is-

l. As an article of manufacture, a push-pin for watches, having the crown permanently secured thereon by being upset, and having the crown -rim at the bottom project below the head of the push-pin, substantially as shown and described.

2. As an article of manufacture, a push-pin for watches, having the crown permanently upset below the head of the push-pin, the pushpin being annularly grooved on the under side of its head to fit over the pendant ot' a watch, substantially as and for the purpose specified.

3. As an article of manufacture, a push-pin for watches, having the crown secured thereon by being upset upon the head of the pushpin, substantially as and for the purpose specitied.

4. As a new article of manufacture, a pushpiu for watches, the shank of which is made square on the bottom, and is provided at the top with a head, in combination with a gold or silver cap, which is forced upon said head and secured thereon by being upset, the outer face of said cap being cylindrical, substantially as shown.

In testimony of which invention I hereunto set my hand.

THEODORE MUELLEP'.

Witnesses H. L. ROBERTS, HENRY F. WALroN.

IOO 

